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9.3. Structural Design
Since the UML packages are mapped for the implementation to C++ name spaces, those can
be directly found in the generator C++ implementation.
9.3. Structural Design
As for the openETCS domain framework in Section 8.3, the classes defined by the use cases
in the prior section have to be transferred to a structural design. In contrast to the domain
framework, most parts of the generator application are especially developed for the openETCS
meta model, which mainly renders the re-usability 1 , in most classes, impossible. Thus, the
definition of a sophisticated object-oriented design pattern [32] is here not required and may
even cause unnecessary workload. Figure 9.2 introduces the structural design for the generator
application. The design details are discussed in groups of the surrounding packages in the next
Figure 9.2.: UML class diagram openETCS generator application
paragraphs.
GEN The openETCS generator classes do not provide a special software design pattern. Only,
CGenerator is used as base class for all concrete generator classes to provide operations and
attributes needed for each generator and to define abstract operations [64, 79], which have to
be implemented. This could be interpreted as a composite design pattern [32, pp. 163-173],
but since CMain only uses compositions of the concrete generator classes, it is not. CMain
combines all generator classes and provides an operation, which can be called by the mainfunction
[79] of the generator application. Furthermore, it has a composition m_Lexer to
1 for other meta models
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